Dell EMC Solutions Enabler 9.2 SRDF Family CLI User Guide

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SRDF pair states

Device pairs that are subject to any SRDF operation need to be in the correct state. Otherwise, the operation fails.

The Solutions Enabler SRDF Family State Tables Guide lists control actions and the prerequisite SRDF pair state for each action.

Commands to display, query and verify SRDF configurations describes the SYMCLI commands to verify pair states.

The following table lists the name and description of SRDF pair states.

Table 1. SRDF pair states
Pair State	Description
SyncInProg	Synchronization is currently in progress between the R1 and the R2 devices. There are existing invalid tracks between the two pairs, and the logical links between both sides of an SRDF pair are up.
Synchronized	The R1 and the R2 are currently in a synchronized state. The same content exists on the R2 as the R1, and there are no invalid tracks between the two pairs.
Split	The R1 and the R2 are currently ready to their hosts. However, the links are not ready or, are write disabled.
Failed Over	The R1 is not ready or write disabled. Operations have been failed over to R2.
R1 Updated	The R1 is not ready or write disabled to the host. There are no local invalid tracks on the R1 side, and the links are ready or write disabled.
R1 UpdInProg	The R1 is not ready or write disabled to the host. There are invalid local (R1) tracks on the source side, so data is being copied from the R2 to the R1 device, and the links are ready.
ActiveActive	The R1 and the R2 are currently in the default SRDF/Metro configuration which uses an Array Witness or Virtual Witness: There are no invalid tracks between the two pairs. The R1 and the R2 are Ready (RW) to the hosts.
ActiveBias	The R1 and the R2 are currently in an SRDF/Metro configuration using bias: The user has specified “use bias” during the establish/restore action or the desired Witness is not available There are no invalid tracks between the two pairs. The R1 and the R2 are Ready (RW) to the hosts.
Suspended	The SRDF links have been suspended and are not ready or write disabled. If the R1 is ready while the links are suspended, any I/O accumulates as invalid tracks owed to the R2.
Partitioned	The SYMAPI is currently unable to communicate through the corresponding SRDF path to the remote array. The Partitioned state may apply to devices within an RA group. For example, if SYMAPI is unable to communicate to a remote array from an RA group, devices in that RA group will be marked as being in the Partitioned state. A half pair and a duplicate pair are also reported as Partitioned.
Mixed	A composite SYMAPI device group SRDF pair state. There are different SRDF pair states within a device group.
Invalid	This is the default state when no other SRDF state applies. The combination of the R1 device, the R2 device, and the SRDF link states do not match any other pair state. This state may occur if there is a problem at the disk director level.
Consistent	The R2 SRDF/A capable devices are in a consistent state. The consistent state signifies the normal state of operation for device pairs operating in asynchronous mode.
Transmit Idle	The SRDF/A session cannot send data in the transmit cycle over the link because the link is unavailable.